package com.dims_hsrc.common.utils;


import java.security.MessageDigest;

/**
 * 加密工具
 *
 * @author Administrator
 */
public class UEncryptUtil {


    private final static String[] hexDigits = {"0", "1", "2", "3", "4",
            "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};


    /**
     * 对字符串进行MD5加密
     *
     * @param originString
     * @return
     */
    public static String MD5Encrypt(String originString) {
        if (originString != null) {
            try {
                MessageDigest messageDigest = MessageDigest.getInstance("MD5");
                //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算
                byte[] o = originString.getBytes();
                messageDigest.update(originString.getBytes());
                byte[] results = messageDigest.digest();
                //将得到的字节数组变成字符串返回
                String resultString = byteArrayToHexString(results);
                String pass = resultString.toLowerCase();
                return pass;
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
        return null;
    }

    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++) {
            String c = byteToHexString(b[i]);
            resultSb.append(c);
        }
        return resultSb.toString();
    }

    /**
     * 将一个字节转化成十六进制形式的字符串
     */
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n = 256 + n;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }


    public static void main(String[] args) {
        System.out.println(MD5Encrypt("123"));
    }

}
